从C#类访问ASP.NET页的TextBox值 [英] Access TextBox value of an ASP.NET page from C# class

问题描述

假设ASP.NET页上有一个TextBox

Say there is a TextBox on an ASP.NET page

<asp:TextBox id="DateTextBox" runat="server" />

在代码的后面设置了一些值.

with some value set in the code-behind.

如何通过HttpContext或其他方式从另一类C#代码文件访问该值?

How to access that value from another class of C# code-file through HttpContext or any other way?

推荐答案

即使是静态方法，也可以通过HttpContext访问页面中的属性.

You can access a property in you page via HttpContext even from a static method.

在您的页面中:

public string DateTextBoxText
{
    get{ return this.DateTextBox.Text; }
    set{ this.DateTextBox.Text = value; }
}

其他地方(即使在其他dll中):

somewhere else(even in a different dll):

public class Data
{
   public static string GetData() 
   { 
       TypeOfYourPage page = HttpContext.Current.Handler as TypeOfYourPage;
       if (page != null)
       {
          return page.DateTextBoxText;
          //btw, what a strange method!
       }
       return null;
    }
}

请注意，只有在此页面的生命周期内调用此方法时，此方法才有效.

Note that this works only if it's called from within a lifecycle of this page.

通常最好使用ViewState或Session在回发期间维护变量.或者，当您引用此页面时，直接使用上面的属性即可.

It's normally better to use ViewState or Session to maintain variables across postback. Or just use the property above directly when you have a reference to this page.

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